Deformation associated with gypsum karst in the Salt River Escarpment, northeastern Alberta

• Published in: Canadian Journal of Earth Sciences
• Main Authors: Tsui, Po C., Cruden, David M.
• Format: Article in Journal/Newspaper
• Language: English
• Published: Canadian Science Publishing 1984
• Subjects: Fort Smith; Keg River; Northwest Territories; Salt River; Slave River
• Online Access: http://dx.doi.org/10.1139/e84-099; http://www.nrcresearchpress.com/doi/pdf/10.1139/e84-099

An escarpment formed by the carbonate Keg River and evaporitic Chinchaga formations of Middle Devonian age extends southwards from the Slave River 30 km west of Fort Smith, Northwest Territories. Newly described folds in the bedrock are due to hydration of the anhydrite to gypsum in the Chinchaga Formation underlying the escarpment. Local groundwater flow has also dissolved subsurface cavities in the Chinchaga Formation. As these openings grew, the carbonates of the Keg River Formation subsided along stepped normal faults. Depressions within the fault blocks occurred where subsidence was concentrated along joints.